Electrons—long used to treat surface tumors and to generate X-rays—are light, nimble particles, far easier to control than protons or carbon ions. At low energies, they stop quickly in tissue, but new high-energy systems can drive electrons deeper. Now researchers are working on machines that combine multiple high-energy beams at different angles to let doctors sculpt radiation doses that match the tumor’s shape.
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Agriculture businessman David Farley was picked on Saturday as the One Nation candidate for the 9 May byelection for Farrer, which Ley held for 25 years.，详情可参考新收录的资料
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